We have been asked not to paraphrase or restate the memory management
rules in this forum because slight inaccuracies, imprecisions,
misstatements, or just idiocy confuses people. Here is a quote:
From
file:///Developer/Documentation/DocSets/com.apple.ADC_Reference_Library.CoreReference.docset/Contents/Resources/Documents/documentation/Cocoa/Conceptual/CocoaFundamentals/CocoaObjects/chapter_3_section_5.html
If you create an object by allocating and initializing it (for
example, [[MyClass alloc] init]), you own the object and are
responsible for releasing it. This rule also applies if you use the
NSObject convenience method new.
If you copy an object, you own the copied object and are responsible
for releasing it.
If you retain an object, you have partial ownership of the object and
must release it when you no longer need it.
Conversely,
If you receive an object from some other object, you do not own the
object and should not release it. (There are a handful of exceptions
to this rule, which are explicitly noted in the reference
documentation.)
As with any set of rules, there are exceptions and “gotchas”:
If you create an object using a class factory method (such as the
NSMutableArray arrayWithCapacity: method), assume that the object you
receive has been autoreleased. You should not release the object
yourself and should retain it if you want to keep it around.
To avoid cyclic references, a child object should never retain its
parent. (A parent is the creator of the child or is an object holding
the child as instance variable.)
Note: “Release” in the above guidelines means sending either a release
message or an autorelease message to an object.
If you do not follow this ownership policy, two bad things are likely
to happen in your Cocoa program. Because you did not release created,
copied, or retained objects, your program is now leaking memory. Or
your program crashes because you sent a message to an object that was
deallocated out from under you. And here’s a further caveat: debugging
these problems can be a time-consuming affair._______________________________________________
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